How to choose between PDF annotation software and handwritten annotations for Windows computers

Key points of this article

Only for highlighting and text notes, it is enough to use the built-in annotation of the reader; if you need a writing experience, consider a digital pen device.
To modify the text, signature or fill in a form, you should choose the desktop PDF editor, which has a different purpose than the simple annotation tool.
Scans can be circled, but the text must be OCR recognized before it can be selected, searched and modified. The recognition results need to be checked paragraph by paragraph.
Sensitive documents such as contracts and unpublished papers should be processed with desktop software that runs offline first to avoid uploading them to the web.

Many people open a PDF on a Windows computer and want to circle key points, write a few comments, or sign their name, only to find that there are a variety of software options available. Some people just want to write "This article will be discussed later" next to a certain paragraph of the contract, some people want to mark each page of the paper by hand, and some people just want to fill in a name on the scanned copy. Different needs require different tools.

This article is written for ordinary users, students and professionals who deal with PDF annotations on Windows. After reading this, you will be able to determine which situation you fall into, know which practices are truly close to handwritten annotations, which are just text annotations or signatures, and understand what operations can be completed in the OmniDoc desktop client.

Let me start with the conclusion: If you want to make handwritten circles like taking notes on paper, you should give priority to a reader or stylus device that supports digital pens; if you want to change text, sign, fill in forms, or compare versions, a desktop PDF editor is more suitable.

Which Windows PDF annotation software is right for you? One sentence conclusion

First look at the needs at hand. If you only want to make circle drawings and text notes, it is enough to use the annotation tool that comes with the reader; if you need a handwriting feeling and take notes frequently, you need a stylus device; if you want to correct the text or sign, use an editor. The table below gives suggestions based on common situations.

your situation	Recommended practices	reason
Occasionally highlight and add text notes without making changes	The annotation tool that comes with the reader	Quick to get started, comments are separated from the original text, and deletion is easy
Often handwrite notes and draw pictures on PDFs	Digital pen plus reader	The writing feel is close to that of paper, and the handwritten content is saved in the form of annotations.
Need to modify the text, signature, and fill in the form	Desktop PDF editor	Ability to change paragraph text in the original position, support signature and form filling
I got a scanned copy and want to find or modify the text.	First OCR recognition, then enter the editor	Only after recognition can the text be selected, searched and modified.
The document involves contracts or undisclosed information	Desktop software that runs offline	Files do not have to be uploaded to the web, reducing privacy risks

What are the different methods?

The annotation tool that comes with the reader

Most PDF readers on Windows offer highlighting, underlining, sticky notes, and some also include free-drawing brushes. Its advantage is that it is ready to use. Comments are usually saved as independent content, and deleting comments will not change the text. The shortcoming is that the more functions there are, the more complex the interface becomes, and when writing with a mouse or touchpad, the handwriting is usually not natural enough.

Digital pen plus reader

Pair a stylus with your touch-enabled Windows tablet, 2-in-1 laptop, or pen display to write directly in the reader. It is suitable for reading notes, review circles and exercise calculations. The threshold lies in the cost of the equipment. Pen pressure and writing delay depend on the hardware and software combination. It is recommended to try before buying. The handwritten content is generally saved as comments. Before changing computers, make sure that the comments are saved with the file.

Online annotation website

Open the webpage to upload the PDF, annotate it in the browser and download the result. No installation required, can be used on another computer. The shortcomings are also obvious: files need to be uploaded to a third-party server, and you must be extra cautious when involving contracts, medical records, or unpublished papers; when the network is unstable, the operating experience of large files will become worse; the free and paid restrictions must be clearly understood one by one.

Desktop PDF Editor

Its focus is not just on annotations, but on modifying content: directly changing paragraph text, signing, filling out forms, blacking out sensitive information, adding, deleting and rearranging pages, comparing two versions, and exporting to Word or Excel. The shortcoming is that the interface is more complicated than a pure reader. If you just draw circles, many functions cannot be used. The OmniDoc desktop client's PDF editor falls into this category, as explained in the next section.

📊 Core comparison

practice	Handwriting feeling	Can the text be modified?	Does the file need to be uploaded?	Scans and large files	How to save comments or modifications
Reader comes with annotations	Depends on whether it has a brush function	cannot	no	Scans can usually only be circled and text cannot be selected.	Annotations are saved separately from the original text
Digital pen plus reader	Close to pen and paper	cannot	no	Depends on device performance	Handwritten content is saved as annotations
Online annotation website	generally	Depends on function	yes	Affected by network and file size	Often requires downloading new files
Desktop PDF editor	Focus on signatures, handwriting brushes are not the focus	Can	no	You can OCR first and then edit	Modify directly or export to other formats

🎯 Which method is suitable for you?

If you just want to highlight and add a few notes

Just use the annotation tool that comes with the reader. The annotations are separated from the original text, so it is not difficult to change them.

If you often handwrite notes or draw pictures on PDFs

Prepare a digital pen and a device that supports touch writing, write in the reader, and confirm that the comments have been saved with the file.

If you want to correct the text, sign or fill in a form

Select the desktop PDF editor, modify the paragraph text in the original position, sign or fill in the form, and then save or export.

If you are working on a contract or an unpublished paper draft

Prefer desktop software that runs offline to avoid handing files over to web services for processing.

If you get the scanned copy

First perform OCR recognition so that the text can be selected and searched, and then decide whether to draw it with annotation circles or enter the editor to modify it.

How to do it in OmniDoc

The PDF editor of the OmniDoc desktop client supports modifying paragraph text, signing, filling out forms, blackening, page manipulation, OCR recognition, comparing two PDFs and exporting. It currently does not have a free handwriting brush, and handwriting-related needs can be handled with the signature function. The steps are as follows:

Go to download.omnidoc.top to download and install the Windows version desktop client.
Open the PDF editor and import the file to be processed.
When you need to modify the text, edit the paragraph content at the original position.
When you need to sign or fill in a form, use the corresponding function and save it after completion.
The scanned document must be OCR recognized first, and then edited after the recognition is completed. OCR results need to be checked paragraph by paragraph, especially numbers, dates and names.
When you need to check with the old version, use the comparison function; when you need secondary processing, export it to Word or Excel.

❓ Frequently Asked Questions (FAQ)

1. Is it necessary to buy a stylus to make PDF handwritten annotations on Windows?

uncertain. If you only want to make circle drawings and text notes, the annotation tools that come with the reader are enough; only when you need the feeling of writing, it is worth considering a digital pen device.

2. Will comments change the original PDF?

Depends on software and saving method. Annotations in most readers are saved as independent content, and the text remains unchanged after deletion. To be sure, you can try it on a copy first.

3. Can the scanned PDF be annotated?

Circles can be drawn, but text cannot usually be selected. To search or modify text, you need to perform OCR recognition first and check the recognition results.

4. How to determine whether a PDF is a scanned copy?

Try selecting a piece of text with your mouse. Can be selected and copied, usually a text version; cannot be selected, can only be framed on the entire page, most of which are scanned copies or pictures.

5. Can I still see the comments if I change my computer?

Depends on how it is saved. Comments written into files can usually be seen on other computers; if they are only saved in the local cache of the software, they may be lost after changing computers. It is recommended to export an annotated copy before switching devices.

📝 Summary

When choosing PDF annotation software on Windows, first distinguish whether you want circled notes, handwritten notes, or text modifications and signatures. If you need a strong sense of handwriting, it is more suitable to use a reader and a handwriting device; to change content and signatures, use a desktop editor; when sensitive files are involved, offline processing is preferred.

Open OmniDoc and use the PDF editor to work with your document